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server.py
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# This program is partly derived from an example program for an Avahi
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# service publisher, downloaded from
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# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
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# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
 
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# following functions: "AvahiService.add", "AvahiService.remove",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
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# 
13
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# Everything else is
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# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
 
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# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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# 
17
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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#     GNU General Public License for more details.
26
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# 
27
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# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
30
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# 
31
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# Contact the authors at <mandos@fukt.bsnet.se>.
32
30
# 
33
31
 
34
 
from __future__ import division, with_statement, absolute_import
 
32
from __future__ import division
35
33
 
36
34
import SocketServer
37
35
import socket
38
 
import optparse
 
36
import select
 
37
from optparse import OptionParser
39
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import datetime
40
39
import errno
41
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import gnutls.crypto
55
54
import stat
56
55
import logging
57
56
import logging.handlers
58
 
import pwd
59
 
from contextlib import closing
60
57
 
61
58
import dbus
62
 
import dbus.service
63
59
import gobject
64
60
import avahi
65
61
from dbus.mainloop.glib import DBusGMainLoop
66
62
import ctypes
67
 
import ctypes.util
68
 
 
69
 
version = "1.0.8"
 
63
 
 
64
# Brief description of the operation of this program:
 
65
# 
 
66
# This server announces itself as a Zeroconf service.  Connecting
 
67
# clients use the TLS protocol, with the unusual quirk that this
 
68
# server program acts as a TLS "client" while a connecting client acts
 
69
# as a TLS "server".  The client (acting as a TLS "server") must
 
70
# supply an OpenPGP certificate, and the fingerprint of this
 
71
# certificate is used by this server to look up (in a list read from a
 
72
# file at start time) which binary blob to give the client.  No other
 
73
# authentication or authorization is done by this server.
 
74
 
70
75
 
71
76
logger = logging.Logger('mandos')
72
 
syslogger = (logging.handlers.SysLogHandler
73
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
 
              address = "/dev/log"))
75
 
syslogger.setFormatter(logging.Formatter
76
 
                       ('Mandos [%(process)d]: %(levelname)s:'
77
 
                        ' %(message)s'))
 
77
syslogger = logging.handlers.SysLogHandler\
 
78
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
79
syslogger.setFormatter(logging.Formatter\
 
80
                        ('%(levelname)s: %(message)s'))
78
81
logger.addHandler(syslogger)
 
82
del syslogger
79
83
 
80
 
console = logging.StreamHandler()
81
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
82
 
                                       ' %(levelname)s: %(message)s'))
83
 
logger.addHandler(console)
84
84
 
85
85
class AvahiError(Exception):
86
 
    def __init__(self, value, *args, **kwargs):
 
86
    def __init__(self, value):
87
87
        self.value = value
88
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
89
 
    def __unicode__(self):
90
 
        return unicode(repr(self.value))
 
88
    def __str__(self):
 
89
        return repr(self.value)
91
90
 
92
91
class AvahiServiceError(AvahiError):
93
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    pass
97
96
 
98
97
 
99
98
class AvahiService(object):
100
 
    """An Avahi (Zeroconf) service.
101
 
    Attributes:
 
99
    """
102
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
103
101
               Used to optionally bind to the specified interface.
104
 
    name: string; Example: 'Mandos'
105
 
    type: string; Example: '_mandos._tcp'.
106
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
107
 
    port: integer; what port to announce
108
 
    TXT: list of strings; TXT record for the service
109
 
    domain: string; Domain to publish on, default to .local if empty.
110
 
    host: string; Host to publish records for, default is localhost
111
 
    max_renames: integer; maximum number of renames
112
 
    rename_count: integer; counter so we only rename after collisions
113
 
                  a sensible number of times
 
102
    name = string; Example: "Mandos"
 
103
    type = string; Example: "_mandos._tcp".
 
104
                   See <http://www.dns-sd.org/ServiceTypes.html>
 
105
    port = integer; what port to announce
 
106
    TXT = list of strings; TXT record for the service
 
107
    domain = string; Domain to publish on, default to .local if empty.
 
108
    host = string; Host to publish records for, default to localhost
 
109
                   if empty.
 
110
    max_renames = integer; maximum number of renames
 
111
    rename_count = integer; counter so we only rename after collisions
 
112
                   a sensible number of times
114
113
    """
115
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
116
 
                 servicetype = None, port = None, TXT = None,
117
 
                 domain = "", host = "", max_renames = 32768,
118
 
                 protocol = avahi.PROTO_UNSPEC):
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
119
118
        self.interface = interface
120
119
        self.name = name
121
 
        self.type = servicetype
 
120
        self.type = type
122
121
        self.port = port
123
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
124
126
        self.domain = domain
125
127
        self.host = host
126
128
        self.rename_count = 0
127
 
        self.max_renames = max_renames
128
 
        self.protocol = protocol
129
129
    def rename(self):
130
130
        """Derived from the Avahi example code"""
131
131
        if self.rename_count >= self.max_renames:
132
 
            logger.critical(u"No suitable Zeroconf service name found"
133
 
                            u" after %i retries, exiting.",
134
 
                            self.rename_count)
135
 
            raise AvahiServiceError(u"Too many renames")
136
 
        self.name = server.GetAlternativeServiceName(self.name)
137
 
        logger.info(u"Changing Zeroconf service name to %r ...",
138
 
                    str(self.name))
139
 
        syslogger.setFormatter(logging.Formatter
140
 
                               ('Mandos (%s): %%(levelname)s:'
141
 
                                ' %%(message)s' % self.name))
 
132
            logger.critical(u"No suitable service name found after %i"
 
133
                            u" retries, exiting.", rename_count)
 
134
            raise AvahiServiceError("Too many renames")
 
135
        name = server.GetAlternativeServiceName(name)
 
136
        logger.notice(u"Changing name to %r ...", name)
142
137
        self.remove()
143
138
        self.add()
144
139
        self.rename_count += 1
150
145
        """Derived from the Avahi example code"""
151
146
        global group
152
147
        if group is None:
153
 
            group = dbus.Interface(bus.get_object
154
 
                                   (avahi.DBUS_NAME,
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
155
150
                                    server.EntryGroupNew()),
156
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
157
152
            group.connect_to_signal('StateChanged',
158
153
                                    entry_group_state_changed)
159
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
160
155
                     service.name, service.type)
161
156
        group.AddService(
162
157
                self.interface,         # interface
163
 
                self.protocol,          # protocol
 
158
                avahi.PROTO_INET6,      # protocol
164
159
                dbus.UInt32(0),         # flags
165
160
                self.name, self.type,
166
161
                self.domain, self.host,
173
168
# End of Avahi example code
174
169
 
175
170
 
176
 
def _datetime_to_dbus(dt, variant_level=0):
177
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
178
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
179
 
 
180
 
 
181
 
class Client(dbus.service.Object):
 
171
class Client(object):
182
172
    """A representation of a client host served by this server.
183
173
    Attributes:
184
 
    name:       string; from the config file, used in log messages and
185
 
                        D-Bus identifiers
 
174
    name:      string; from the config file, used in log messages
186
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
187
176
                 uniquely identify the client
188
 
    secret:     bytestring; sent verbatim (over TLS) to client
189
 
    host:       string; available for use by the checker command
190
 
    created:    datetime.datetime(); (UTC) object creation
191
 
    last_enabled: datetime.datetime(); (UTC)
192
 
    enabled:    bool()
193
 
    last_checked_ok: datetime.datetime(); (UTC) or None
194
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
195
 
                                      until this client is invalid
196
 
    interval:   datetime.timedelta(); How often to start a new checker
197
 
    disable_hook:  If set, called by disable() as disable_hook(self)
198
 
    checker:    subprocess.Popen(); a running checker process used
199
 
                                    to see if the client lives.
200
 
                                    'None' if no process is running.
 
177
    secret:    bytestring; sent verbatim (over TLS) to client
 
178
    fqdn:      string (FQDN); available for use by the checker command
 
179
    created:   datetime.datetime(); object creation, not client host
 
180
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
181
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
182
                                     until this client is invalid
 
183
    interval:  datetime.timedelta(); How often to start a new checker
 
184
    stop_hook: If set, called by stop() as stop_hook(self)
 
185
    checker:   subprocess.Popen(); a running checker process used
 
186
                                   to see if the client lives.
 
187
                                   'None' if no process is running.
201
188
    checker_initiator_tag: a gobject event source tag, or None
202
 
    disable_initiator_tag:    - '' -
 
189
    stop_initiator_tag:    - '' -
203
190
    checker_callback_tag:  - '' -
204
191
    checker_command: string; External command which is run to check if
205
192
                     client lives.  %() expansions are done at
206
193
                     runtime with vars(self) as dict, so that for
207
194
                     instance %(name)s can be used in the command.
208
 
    current_checker_command: string; current running checker_command
209
 
    use_dbus: bool(); Whether to provide D-Bus interface and signals
210
 
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
 
195
    Private attibutes:
 
196
    _timeout: Real variable for 'timeout'
 
197
    _interval: Real variable for 'interval'
 
198
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
199
    _interval_milliseconds: - '' -
211
200
    """
212
 
    def timeout_milliseconds(self):
213
 
        "Return the 'timeout' attribute in milliseconds"
214
 
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
215
 
                + (self.timeout.seconds * 1000)
216
 
                + (self.timeout.microseconds // 1000))
217
 
    
218
 
    def interval_milliseconds(self):
219
 
        "Return the 'interval' attribute in milliseconds"
220
 
        return ((self.interval.days * 24 * 60 * 60 * 1000)
221
 
                + (self.interval.seconds * 1000)
222
 
                + (self.interval.microseconds // 1000))
223
 
    
224
 
    def __init__(self, name = None, disable_hook=None, config=None,
225
 
                 use_dbus=True):
226
 
        """Note: the 'checker' key in 'config' sets the
227
 
        'checker_command' attribute and *not* the 'checker'
228
 
        attribute."""
 
201
    def _set_timeout(self, timeout):
 
202
        "Setter function for 'timeout' attribute"
 
203
        self._timeout = timeout
 
204
        self._timeout_milliseconds = ((self.timeout.days
 
205
                                       * 24 * 60 * 60 * 1000)
 
206
                                      + (self.timeout.seconds * 1000)
 
207
                                      + (self.timeout.microseconds
 
208
                                         // 1000))
 
209
    timeout = property(lambda self: self._timeout,
 
210
                       _set_timeout)
 
211
    del _set_timeout
 
212
    def _set_interval(self, interval):
 
213
        "Setter function for 'interval' attribute"
 
214
        self._interval = interval
 
215
        self._interval_milliseconds = ((self.interval.days
 
216
                                        * 24 * 60 * 60 * 1000)
 
217
                                       + (self.interval.seconds
 
218
                                          * 1000)
 
219
                                       + (self.interval.microseconds
 
220
                                          // 1000))
 
221
    interval = property(lambda self: self._interval,
 
222
                        _set_interval)
 
223
    del _set_interval
 
224
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
225
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
226
                 interval=-1, checker=None):
 
227
        """Note: the 'checker' argument sets the 'checker_command'
 
228
        attribute and not the 'checker' attribute.."""
229
229
        self.name = name
230
 
        if config is None:
231
 
            config = {}
232
230
        logger.debug(u"Creating client %r", self.name)
233
 
        self.use_dbus = False   # During __init__
234
 
        # Uppercase and remove spaces from fingerprint for later
235
 
        # comparison purposes with return value from the fingerprint()
236
 
        # function
237
 
        self.fingerprint = (config["fingerprint"].upper()
238
 
                            .replace(u" ", u""))
 
231
        # Uppercase and remove spaces from fingerprint
 
232
        # for later comparison purposes with return value of
 
233
        # the fingerprint() function
 
234
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
239
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
240
 
        if "secret" in config:
241
 
            self.secret = config["secret"].decode(u"base64")
242
 
        elif "secfile" in config:
243
 
            with closing(open(os.path.expanduser
244
 
                              (os.path.expandvars
245
 
                               (config["secfile"])))) as secfile:
246
 
                self.secret = secfile.read()
 
236
        if secret:
 
237
            self.secret = secret.decode(u"base64")
 
238
        elif secfile:
 
239
            sf = open(secfile)
 
240
            self.secret = sf.read()
 
241
            sf.close()
247
242
        else:
248
243
            raise TypeError(u"No secret or secfile for client %s"
249
244
                            % self.name)
250
 
        self.host = config.get("host", "")
251
 
        self.created = datetime.datetime.utcnow()
252
 
        self.enabled = False
253
 
        self.last_enabled = None
 
245
        self.fqdn = fqdn
 
246
        self.created = datetime.datetime.now()
254
247
        self.last_checked_ok = None
255
 
        self.timeout = string_to_delta(config["timeout"])
256
 
        self.interval = string_to_delta(config["interval"])
257
 
        self.disable_hook = disable_hook
 
248
        self.timeout = string_to_delta(timeout)
 
249
        self.interval = string_to_delta(interval)
 
250
        self.stop_hook = stop_hook
258
251
        self.checker = None
259
252
        self.checker_initiator_tag = None
260
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
261
254
        self.checker_callback_tag = None
262
 
        self.checker_command = config["checker"]
263
 
        self.current_checker_command = None
264
 
        self.last_connect = None
265
 
        # Only now, when this client is initialized, can it show up on
266
 
        # the D-Bus
267
 
        self.use_dbus = use_dbus
268
 
        if self.use_dbus:
269
 
            self.dbus_object_path = (dbus.ObjectPath
270
 
                                     ("/clients/"
271
 
                                      + self.name.replace(".", "_")))
272
 
            dbus.service.Object.__init__(self, bus,
273
 
                                         self.dbus_object_path)
274
 
    
275
 
    def enable(self):
 
255
        self.check_command = checker
 
256
    def start(self):
276
257
        """Start this client's checker and timeout hooks"""
277
 
        self.last_enabled = datetime.datetime.utcnow()
278
258
        # Schedule a new checker to be started an 'interval' from now,
279
259
        # and every interval from then on.
280
 
        self.checker_initiator_tag = (gobject.timeout_add
281
 
                                      (self.interval_milliseconds(),
282
 
                                       self.start_checker))
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
283
263
        # Also start a new checker *right now*.
284
264
        self.start_checker()
285
 
        # Schedule a disable() when 'timeout' has passed
286
 
        self.disable_initiator_tag = (gobject.timeout_add
287
 
                                   (self.timeout_milliseconds(),
288
 
                                    self.disable))
289
 
        self.enabled = True
290
 
        if self.use_dbus:
291
 
            # Emit D-Bus signals
292
 
            self.PropertyChanged(dbus.String(u"enabled"),
293
 
                                 dbus.Boolean(True, variant_level=1))
294
 
            self.PropertyChanged(dbus.String(u"last_enabled"),
295
 
                                 (_datetime_to_dbus(self.last_enabled,
296
 
                                                    variant_level=1)))
297
 
    
298
 
    def disable(self):
299
 
        """Disable this client."""
300
 
        if not getattr(self, "enabled", False):
 
265
        # Schedule a stop() when 'timeout' has passed
 
266
        self.stop_initiator_tag = gobject.timeout_add\
 
267
                                  (self._timeout_milliseconds,
 
268
                                   self.stop)
 
269
    def stop(self):
 
270
        """Stop this client.
 
271
        The possibility that a client might be restarted is left open,
 
272
        but not currently used."""
 
273
        # If this client doesn't have a secret, it is already stopped.
 
274
        if self.secret:
 
275
            logger.debug(u"Stopping client %s", self.name)
 
276
            self.secret = None
 
277
        else:
301
278
            return False
302
 
        logger.info(u"Disabling client %s", self.name)
303
 
        if getattr(self, "disable_initiator_tag", False):
304
 
            gobject.source_remove(self.disable_initiator_tag)
305
 
            self.disable_initiator_tag = None
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
306
282
        if getattr(self, "checker_initiator_tag", False):
307
283
            gobject.source_remove(self.checker_initiator_tag)
308
284
            self.checker_initiator_tag = None
309
285
        self.stop_checker()
310
 
        if self.disable_hook:
311
 
            self.disable_hook(self)
312
 
        self.enabled = False
313
 
        if self.use_dbus:
314
 
            # Emit D-Bus signal
315
 
            self.PropertyChanged(dbus.String(u"enabled"),
316
 
                                 dbus.Boolean(False, variant_level=1))
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
317
288
        # Do not run this again if called by a gobject.timeout_add
318
289
        return False
319
 
    
320
290
    def __del__(self):
321
 
        self.disable_hook = None
322
 
        self.disable()
323
 
    
324
 
    def checker_callback(self, pid, condition, command):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
325
294
        """The checker has completed, so take appropriate actions."""
 
295
        now = datetime.datetime.now()
326
296
        self.checker_callback_tag = None
327
297
        self.checker = None
328
 
        if self.use_dbus:
329
 
            # Emit D-Bus signal
330
 
            self.PropertyChanged(dbus.String(u"checker_running"),
331
 
                                 dbus.Boolean(False, variant_level=1))
332
 
        if os.WIFEXITED(condition):
333
 
            exitstatus = os.WEXITSTATUS(condition)
334
 
            if exitstatus == 0:
335
 
                logger.info(u"Checker for %(name)s succeeded",
336
 
                            vars(self))
337
 
                self.checked_ok()
338
 
            else:
339
 
                logger.info(u"Checker for %(name)s failed",
340
 
                            vars(self))
341
 
            if self.use_dbus:
342
 
                # Emit D-Bus signal
343
 
                self.CheckerCompleted(dbus.Int16(exitstatus),
344
 
                                      dbus.Int64(condition),
345
 
                                      dbus.String(command))
346
 
        else:
 
298
        if os.WIFEXITED(condition) \
 
299
               and (os.WEXITSTATUS(condition) == 0):
 
300
            logger.debug(u"Checker for %(name)s succeeded",
 
301
                         vars(self))
 
302
            self.last_checked_ok = now
 
303
            gobject.source_remove(self.stop_initiator_tag)
 
304
            self.stop_initiator_tag = gobject.timeout_add\
 
305
                                      (self._timeout_milliseconds,
 
306
                                       self.stop)
 
307
        elif not os.WIFEXITED(condition):
347
308
            logger.warning(u"Checker for %(name)s crashed?",
348
309
                           vars(self))
349
 
            if self.use_dbus:
350
 
                # Emit D-Bus signal
351
 
                self.CheckerCompleted(dbus.Int16(-1),
352
 
                                      dbus.Int64(condition),
353
 
                                      dbus.String(command))
354
 
    
355
 
    def checked_ok(self):
356
 
        """Bump up the timeout for this client.
357
 
        This should only be called when the client has been seen,
358
 
        alive and well.
359
 
        """
360
 
        self.last_checked_ok = datetime.datetime.utcnow()
361
 
        gobject.source_remove(self.disable_initiator_tag)
362
 
        self.disable_initiator_tag = (gobject.timeout_add
363
 
                                      (self.timeout_milliseconds(),
364
 
                                       self.disable))
365
 
        if self.use_dbus:
366
 
            # Emit D-Bus signal
367
 
            self.PropertyChanged(
368
 
                dbus.String(u"last_checked_ok"),
369
 
                (_datetime_to_dbus(self.last_checked_ok,
370
 
                                   variant_level=1)))
371
 
    
 
310
        else:
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
372
313
    def start_checker(self):
373
314
        """Start a new checker subprocess if one is not running.
374
315
        If a checker already exists, leave it running and do
381
322
        # checkers alone, the checker would have to take more time
382
323
        # than 'timeout' for the client to be declared invalid, which
383
324
        # is as it should be.
384
 
        
385
 
        # If a checker exists, make sure it is not a zombie
386
 
        if self.checker is not None:
387
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
388
 
            if pid:
389
 
                logger.warning("Checker was a zombie")
390
 
                gobject.source_remove(self.checker_callback_tag)
391
 
                self.checker_callback(pid, status,
392
 
                                      self.current_checker_command)
393
 
        # Start a new checker if needed
394
325
        if self.checker is None:
395
326
            try:
396
 
                # In case checker_command has exactly one % operator
397
 
                command = self.checker_command % self.host
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.fqdn
398
329
            except TypeError:
399
330
                # Escape attributes for the shell
400
331
                escaped_attrs = dict((key, re.escape(str(val)))
401
332
                                     for key, val in
402
333
                                     vars(self).iteritems())
403
334
                try:
404
 
                    command = self.checker_command % escaped_attrs
 
335
                    command = self.check_command % escaped_attrs
405
336
                except TypeError, error:
406
337
                    logger.error(u'Could not format string "%s":'
407
 
                                 u' %s', self.checker_command, error)
 
338
                                 u' %s', self.check_command, error)
408
339
                    return True # Try again later
409
 
                self.current_checker_command = command
410
340
            try:
411
 
                logger.info(u"Starting checker %r for %s",
412
 
                            command, self.name)
413
 
                # We don't need to redirect stdout and stderr, since
414
 
                # in normal mode, that is already done by daemon(),
415
 
                # and in debug mode we don't want to.  (Stdin is
416
 
                # always replaced by /dev/null.)
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
417
343
                self.checker = subprocess.Popen(command,
418
344
                                                close_fds=True,
419
345
                                                shell=True, cwd="/")
420
 
                if self.use_dbus:
421
 
                    # Emit D-Bus signal
422
 
                    self.CheckerStarted(command)
423
 
                    self.PropertyChanged(
424
 
                        dbus.String("checker_running"),
425
 
                        dbus.Boolean(True, variant_level=1))
426
 
                self.checker_callback_tag = (gobject.child_watch_add
427
 
                                             (self.checker.pid,
428
 
                                              self.checker_callback,
429
 
                                              data=command))
430
 
                # The checker may have completed before the gobject
431
 
                # watch was added.  Check for this.
432
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
433
 
                if pid:
434
 
                    gobject.source_remove(self.checker_callback_tag)
435
 
                    self.checker_callback(pid, status, command)
436
 
            except OSError, error:
 
346
                self.checker_callback_tag = gobject.child_watch_add\
 
347
                                            (self.checker.pid,
 
348
                                             self.checker_callback)
 
349
            except subprocess.OSError, error:
437
350
                logger.error(u"Failed to start subprocess: %s",
438
351
                             error)
439
352
        # Re-run this periodically if run by gobject.timeout_add
440
353
        return True
441
 
    
442
354
    def stop_checker(self):
443
355
        """Force the checker process, if any, to stop."""
444
356
        if self.checker_callback_tag:
446
358
            self.checker_callback_tag = None
447
359
        if getattr(self, "checker", None) is None:
448
360
            return
449
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
361
        logger.debug("Stopping checker for %(name)s", vars(self))
450
362
        try:
451
363
            os.kill(self.checker.pid, signal.SIGTERM)
452
364
            #os.sleep(0.5)
456
368
            if error.errno != errno.ESRCH: # No such process
457
369
                raise
458
370
        self.checker = None
459
 
        if self.use_dbus:
460
 
            self.PropertyChanged(dbus.String(u"checker_running"),
461
 
                                 dbus.Boolean(False, variant_level=1))
462
 
    
463
371
    def still_valid(self):
464
372
        """Has the timeout not yet passed for this client?"""
465
 
        if not getattr(self, "enabled", False):
466
 
            return False
467
 
        now = datetime.datetime.utcnow()
 
373
        now = datetime.datetime.now()
468
374
        if self.last_checked_ok is None:
469
375
            return now < (self.created + self.timeout)
470
376
        else:
471
377
            return now < (self.last_checked_ok + self.timeout)
472
 
    
473
 
    ## D-Bus methods & signals
474
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
475
 
    
476
 
    # CheckedOK - method
477
 
    CheckedOK = dbus.service.method(_interface)(checked_ok)
478
 
    CheckedOK.__name__ = "CheckedOK"
479
 
    
480
 
    # CheckerCompleted - signal
481
 
    @dbus.service.signal(_interface, signature="nxs")
482
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
483
 
        "D-Bus signal"
484
 
        pass
485
 
    
486
 
    # CheckerStarted - signal
487
 
    @dbus.service.signal(_interface, signature="s")
488
 
    def CheckerStarted(self, command):
489
 
        "D-Bus signal"
490
 
        pass
491
 
    
492
 
    # GetAllProperties - method
493
 
    @dbus.service.method(_interface, out_signature="a{sv}")
494
 
    def GetAllProperties(self):
495
 
        "D-Bus method"
496
 
        return dbus.Dictionary({
497
 
                dbus.String("name"):
498
 
                    dbus.String(self.name, variant_level=1),
499
 
                dbus.String("fingerprint"):
500
 
                    dbus.String(self.fingerprint, variant_level=1),
501
 
                dbus.String("host"):
502
 
                    dbus.String(self.host, variant_level=1),
503
 
                dbus.String("created"):
504
 
                    _datetime_to_dbus(self.created, variant_level=1),
505
 
                dbus.String("last_enabled"):
506
 
                    (_datetime_to_dbus(self.last_enabled,
507
 
                                       variant_level=1)
508
 
                     if self.last_enabled is not None
509
 
                     else dbus.Boolean(False, variant_level=1)),
510
 
                dbus.String("enabled"):
511
 
                    dbus.Boolean(self.enabled, variant_level=1),
512
 
                dbus.String("last_checked_ok"):
513
 
                    (_datetime_to_dbus(self.last_checked_ok,
514
 
                                       variant_level=1)
515
 
                     if self.last_checked_ok is not None
516
 
                     else dbus.Boolean (False, variant_level=1)),
517
 
                dbus.String("timeout"):
518
 
                    dbus.UInt64(self.timeout_milliseconds(),
519
 
                                variant_level=1),
520
 
                dbus.String("interval"):
521
 
                    dbus.UInt64(self.interval_milliseconds(),
522
 
                                variant_level=1),
523
 
                dbus.String("checker"):
524
 
                    dbus.String(self.checker_command,
525
 
                                variant_level=1),
526
 
                dbus.String("checker_running"):
527
 
                    dbus.Boolean(self.checker is not None,
528
 
                                 variant_level=1),
529
 
                dbus.String("object_path"):
530
 
                    dbus.ObjectPath(self.dbus_object_path,
531
 
                                    variant_level=1)
532
 
                }, signature="sv")
533
 
    
534
 
    # IsStillValid - method
535
 
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
536
 
                    (still_valid))
537
 
    IsStillValid.__name__ = "IsStillValid"
538
 
    
539
 
    # PropertyChanged - signal
540
 
    @dbus.service.signal(_interface, signature="sv")
541
 
    def PropertyChanged(self, property, value):
542
 
        "D-Bus signal"
543
 
        pass
544
 
    
545
 
    # SetChecker - method
546
 
    @dbus.service.method(_interface, in_signature="s")
547
 
    def SetChecker(self, checker):
548
 
        "D-Bus setter method"
549
 
        self.checker_command = checker
550
 
        # Emit D-Bus signal
551
 
        self.PropertyChanged(dbus.String(u"checker"),
552
 
                             dbus.String(self.checker_command,
553
 
                                         variant_level=1))
554
 
    
555
 
    # SetHost - method
556
 
    @dbus.service.method(_interface, in_signature="s")
557
 
    def SetHost(self, host):
558
 
        "D-Bus setter method"
559
 
        self.host = host
560
 
        # Emit D-Bus signal
561
 
        self.PropertyChanged(dbus.String(u"host"),
562
 
                             dbus.String(self.host, variant_level=1))
563
 
    
564
 
    # SetInterval - method
565
 
    @dbus.service.method(_interface, in_signature="t")
566
 
    def SetInterval(self, milliseconds):
567
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
568
 
        # Emit D-Bus signal
569
 
        self.PropertyChanged(dbus.String(u"interval"),
570
 
                             (dbus.UInt64(self.interval_milliseconds(),
571
 
                                          variant_level=1)))
572
 
    
573
 
    # SetSecret - method
574
 
    @dbus.service.method(_interface, in_signature="ay",
575
 
                         byte_arrays=True)
576
 
    def SetSecret(self, secret):
577
 
        "D-Bus setter method"
578
 
        self.secret = str(secret)
579
 
    
580
 
    # SetTimeout - method
581
 
    @dbus.service.method(_interface, in_signature="t")
582
 
    def SetTimeout(self, milliseconds):
583
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
584
 
        # Emit D-Bus signal
585
 
        self.PropertyChanged(dbus.String(u"timeout"),
586
 
                             (dbus.UInt64(self.timeout_milliseconds(),
587
 
                                          variant_level=1)))
588
 
    
589
 
    # Enable - method
590
 
    Enable = dbus.service.method(_interface)(enable)
591
 
    Enable.__name__ = "Enable"
592
 
    
593
 
    # StartChecker - method
594
 
    @dbus.service.method(_interface)
595
 
    def StartChecker(self):
596
 
        "D-Bus method"
597
 
        self.start_checker()
598
 
    
599
 
    # Disable - method
600
 
    @dbus.service.method(_interface)
601
 
    def Disable(self):
602
 
        "D-Bus method"
603
 
        self.disable()
604
 
    
605
 
    # StopChecker - method
606
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
607
 
    StopChecker.__name__ = "StopChecker"
608
 
    
609
 
    del _interface
610
378
 
611
379
 
612
380
def peer_certificate(session):
613
381
    "Return the peer's OpenPGP certificate as a bytestring"
614
382
    # If not an OpenPGP certificate...
615
 
    if (gnutls.library.functions
616
 
        .gnutls_certificate_type_get(session._c_object)
617
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
383
    if gnutls.library.functions.gnutls_certificate_type_get\
 
384
            (session._c_object) \
 
385
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
618
386
        # ...do the normal thing
619
387
        return session.peer_certificate
620
 
    list_size = ctypes.c_uint(1)
621
 
    cert_list = (gnutls.library.functions
622
 
                 .gnutls_certificate_get_peers
623
 
                 (session._c_object, ctypes.byref(list_size)))
624
 
    if not bool(cert_list) and list_size.value != 0:
625
 
        raise gnutls.errors.GNUTLSError("error getting peer"
626
 
                                        " certificate")
 
388
    list_size = ctypes.c_uint()
 
389
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
390
        (session._c_object, ctypes.byref(list_size))
627
391
    if list_size.value == 0:
628
392
        return None
629
393
    cert = cert_list[0]
632
396
 
633
397
def fingerprint(openpgp):
634
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
635
 
    # New GnuTLS "datum" with the OpenPGP public key
636
 
    datum = (gnutls.library.types
637
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
638
 
                                         ctypes.POINTER
639
 
                                         (ctypes.c_ubyte)),
640
 
                             ctypes.c_uint(len(openpgp))))
641
399
    # New empty GnuTLS certificate
642
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
643
 
    (gnutls.library.functions
644
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
401
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
402
        (ctypes.byref(crt))
 
403
    # New GnuTLS "datum" with the OpenPGP public key
 
404
    datum = gnutls.library.types.gnutls_datum_t\
 
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
406
                     ctypes.POINTER(ctypes.c_ubyte)),
 
407
         ctypes.c_uint(len(openpgp)))
645
408
    # Import the OpenPGP public key into the certificate
646
 
    (gnutls.library.functions
647
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
648
 
                                gnutls.library.constants
649
 
                                .GNUTLS_OPENPGP_FMT_RAW))
650
 
    # Verify the self signature in the key
651
 
    crtverify = ctypes.c_uint()
652
 
    (gnutls.library.functions
653
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
654
 
    if crtverify.value != 0:
655
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
656
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
657
413
    # New buffer for the fingerprint
658
 
    buf = ctypes.create_string_buffer(20)
659
 
    buf_len = ctypes.c_size_t()
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
660
416
    # Get the fingerprint from the certificate into the buffer
661
 
    (gnutls.library.functions
662
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
663
 
                                         ctypes.byref(buf_len)))
 
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
664
419
    # Deinit the certificate
665
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
666
421
    # Convert the buffer to a Python bytestring
667
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
668
423
    # Convert the bytestring to hexadecimal notation
669
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
670
425
    return hex_fpr
671
426
 
672
427
 
673
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
674
429
    """A TCP request handler class.
675
430
    Instantiated by IPv6_TCPServer for each request to handle it.
676
431
    Note: This will run in its own forked process."""
677
432
    
678
433
    def handle(self):
679
 
        logger.info(u"TCP connection from: %s",
680
 
                    unicode(self.client_address))
681
 
        session = (gnutls.connection
682
 
                   .ClientSession(self.request,
683
 
                                  gnutls.connection
684
 
                                  .X509Credentials()))
685
 
        
686
 
        line = self.request.makefile().readline()
687
 
        logger.debug(u"Protocol version: %r", line)
688
 
        try:
689
 
            if int(line.strip().split()[0]) > 1:
690
 
                raise RuntimeError
691
 
        except (ValueError, IndexError, RuntimeError), error:
692
 
            logger.error(u"Unknown protocol version: %s", error)
693
 
            return
694
 
        
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
        session = gnutls.connection.ClientSession\
 
437
                  (self.request, gnutls.connection.X509Credentials())
695
438
        # Note: gnutls.connection.X509Credentials is really a generic
696
439
        # GnuTLS certificate credentials object so long as no X.509
697
440
        # keys are added to it.  Therefore, we can use it here despite
698
441
        # using OpenPGP certificates.
699
442
        
700
443
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
701
 
        #                     "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
702
 
        #                     "+DHE-DSS"))
703
 
        # Use a fallback default, since this MUST be set.
704
 
        priority = self.server.settings.get("priority", "NORMAL")
705
 
        (gnutls.library.functions
706
 
         .gnutls_priority_set_direct(session._c_object,
707
 
                                     priority, None))
 
444
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
445
        #                "+DHE-DSS"))
 
446
        priority = "NORMAL"             # Fallback default, since this
 
447
                                        # MUST be set.
 
448
        if self.server.settings["priority"]:
 
449
            priority = self.server.settings["priority"]
 
450
        gnutls.library.functions.gnutls_priority_set_direct\
 
451
            (session._c_object, priority, None);
708
452
        
709
453
        try:
710
454
            session.handshake()
711
455
        except gnutls.errors.GNUTLSError, error:
712
 
            logger.warning(u"Handshake failed: %s", error)
 
456
            logger.debug(u"Handshake failed: %s", error)
713
457
            # Do not run session.bye() here: the session is not
714
458
            # established.  Just abandon the request.
715
459
            return
716
 
        logger.debug(u"Handshake succeeded")
717
460
        try:
718
461
            fpr = fingerprint(peer_certificate(session))
719
462
        except (TypeError, gnutls.errors.GNUTLSError), error:
720
 
            logger.warning(u"Bad certificate: %s", error)
 
463
            logger.debug(u"Bad certificate: %s", error)
721
464
            session.bye()
722
465
            return
723
466
        logger.debug(u"Fingerprint: %s", fpr)
724
 
        
 
467
        client = None
725
468
        for c in self.server.clients:
726
469
            if c.fingerprint == fpr:
727
470
                client = c
728
471
                break
729
 
        else:
730
 
            logger.warning(u"Client not found for fingerprint: %s",
731
 
                           fpr)
 
472
        if not client:
 
473
            logger.debug(u"Client not found for fingerprint: %s", fpr)
732
474
            session.bye()
733
475
            return
734
476
        # Have to check if client.still_valid(), since it is possible
735
477
        # that the client timed out while establishing the GnuTLS
736
478
        # session.
737
479
        if not client.still_valid():
738
 
            logger.warning(u"Client %(name)s is invalid",
739
 
                           vars(client))
 
480
            logger.debug(u"Client %(name)s is invalid", vars(client))
740
481
            session.bye()
741
482
            return
742
 
        ## This won't work here, since we're in a fork.
743
 
        # client.checked_ok()
744
483
        sent_size = 0
745
484
        while sent_size < len(client.secret):
746
485
            sent = session.send(client.secret[sent_size:])
751
490
        session.bye()
752
491
 
753
492
 
754
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
755
 
                     SocketServer.TCPServer, object):
756
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
493
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
494
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
757
495
    Attributes:
758
496
        settings:       Server settings
759
497
        clients:        Set() of Client objects
760
 
        enabled:        Boolean; whether this server is activated yet
761
498
    """
762
499
    address_family = socket.AF_INET6
763
500
    def __init__(self, *args, **kwargs):
767
504
        if "clients" in kwargs:
768
505
            self.clients = kwargs["clients"]
769
506
            del kwargs["clients"]
770
 
        if "use_ipv6" in kwargs:
771
 
            if not kwargs["use_ipv6"]:
772
 
                self.address_family = socket.AF_INET
773
 
            del kwargs["use_ipv6"]
774
 
        self.enabled = False
775
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
507
        return super(type(self), self).__init__(*args, **kwargs)
776
508
    def server_bind(self):
777
509
        """This overrides the normal server_bind() function
778
510
        to bind to an interface if one was specified, and also NOT to
786
518
                                       self.settings["interface"])
787
519
            except socket.error, error:
788
520
                if error[0] == errno.EPERM:
789
 
                    logger.error(u"No permission to"
790
 
                                 u" bind to interface %s",
791
 
                                 self.settings["interface"])
 
521
                    logger.warning(u"No permission to"
 
522
                                   u" bind to interface %s",
 
523
                                   self.settings["interface"])
792
524
                else:
793
 
                    raise
 
525
                    raise error
794
526
        # Only bind(2) the socket if we really need to.
795
527
        if self.server_address[0] or self.server_address[1]:
796
528
            if not self.server_address[0]:
797
 
                if self.address_family == socket.AF_INET6:
798
 
                    any_address = "::" # in6addr_any
799
 
                else:
800
 
                    any_address = socket.INADDR_ANY
801
 
                self.server_address = (any_address,
 
529
                in6addr_any = "::"
 
530
                self.server_address = (in6addr_any,
802
531
                                       self.server_address[1])
803
 
            elif not self.server_address[1]:
 
532
            elif self.server_address[1] is None:
804
533
                self.server_address = (self.server_address[0],
805
534
                                       0)
806
 
#                 if self.settings["interface"]:
807
 
#                     self.server_address = (self.server_address[0],
808
 
#                                            0, # port
809
 
#                                            0, # flowinfo
810
 
#                                            if_nametoindex
811
 
#                                            (self.settings
812
 
#                                             ["interface"]))
813
 
            return super(IPv6_TCPServer, self).server_bind()
814
 
    def server_activate(self):
815
 
        if self.enabled:
816
 
            return super(IPv6_TCPServer, self).server_activate()
817
 
    def enable(self):
818
 
        self.enabled = True
 
535
            return super(type(self), self).server_bind()
819
536
 
820
537
 
821
538
def string_to_delta(interval):
822
539
    """Parse a string and return a datetime.timedelta
823
 
    
 
540
 
824
541
    >>> string_to_delta('7d')
825
542
    datetime.timedelta(7)
826
543
    >>> string_to_delta('60s')
831
548
    datetime.timedelta(1)
832
549
    >>> string_to_delta(u'1w')
833
550
    datetime.timedelta(7)
834
 
    >>> string_to_delta('5m 30s')
835
 
    datetime.timedelta(0, 330)
836
551
    """
837
 
    timevalue = datetime.timedelta(0)
838
 
    for s in interval.split():
839
 
        try:
840
 
            suffix = unicode(s[-1])
841
 
            value = int(s[:-1])
842
 
            if suffix == u"d":
843
 
                delta = datetime.timedelta(value)
844
 
            elif suffix == u"s":
845
 
                delta = datetime.timedelta(0, value)
846
 
            elif suffix == u"m":
847
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
848
 
            elif suffix == u"h":
849
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
850
 
            elif suffix == u"w":
851
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
852
 
            else:
853
 
                raise ValueError
854
 
        except (ValueError, IndexError):
 
552
    try:
 
553
        suffix=unicode(interval[-1])
 
554
        value=int(interval[:-1])
 
555
        if suffix == u"d":
 
556
            delta = datetime.timedelta(value)
 
557
        elif suffix == u"s":
 
558
            delta = datetime.timedelta(0, value)
 
559
        elif suffix == u"m":
 
560
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
561
        elif suffix == u"h":
 
562
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
563
        elif suffix == u"w":
 
564
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
565
        else:
855
566
            raise ValueError
856
 
        timevalue += delta
857
 
    return timevalue
 
567
    except (ValueError, IndexError):
 
568
        raise ValueError
 
569
    return delta
858
570
 
859
571
 
860
572
def server_state_changed(state):
861
573
    """Derived from the Avahi example code"""
862
574
    if state == avahi.SERVER_COLLISION:
863
 
        logger.error(u"Zeroconf server name collision")
 
575
        logger.warning(u"Server name collision")
864
576
        service.remove()
865
577
    elif state == avahi.SERVER_RUNNING:
866
578
        service.add()
868
580
 
869
581
def entry_group_state_changed(state, error):
870
582
    """Derived from the Avahi example code"""
871
 
    logger.debug(u"Avahi state change: %i", state)
 
583
    logger.debug(u"state change: %i", state)
872
584
    
873
585
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
874
 
        logger.debug(u"Zeroconf service established.")
 
586
        logger.debug(u"Service established.")
875
587
    elif state == avahi.ENTRY_GROUP_COLLISION:
876
 
        logger.warning(u"Zeroconf service name collision.")
 
588
        logger.warning(u"Service name collision.")
877
589
        service.rename()
878
590
    elif state == avahi.ENTRY_GROUP_FAILURE:
879
 
        logger.critical(u"Avahi: Error in group state changed %s",
 
591
        logger.critical(u"Error in group state changed %s",
880
592
                        unicode(error))
881
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
593
        raise AvahiGroupError("State changed: %s", str(error))
882
594
 
883
 
def if_nametoindex(interface):
 
595
def if_nametoindex(interface, _func=[None]):
884
596
    """Call the C function if_nametoindex(), or equivalent"""
885
 
    global if_nametoindex
 
597
    if _func[0] is not None:
 
598
        return _func[0](interface)
886
599
    try:
887
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
888
 
                          (ctypes.util.find_library("c"))
889
 
                          .if_nametoindex)
 
600
        if "ctypes.util" not in sys.modules:
 
601
            import ctypes.util
 
602
        while True:
 
603
            try:
 
604
                libc = ctypes.cdll.LoadLibrary\
 
605
                       (ctypes.util.find_library("c"))
 
606
                _func[0] = libc.if_nametoindex
 
607
                return _func[0](interface)
 
608
            except IOError, e:
 
609
                if e != errno.EINTR:
 
610
                    raise
890
611
    except (OSError, AttributeError):
891
612
        if "struct" not in sys.modules:
892
613
            import struct
893
614
        if "fcntl" not in sys.modules:
894
615
            import fcntl
895
 
        def if_nametoindex(interface):
 
616
        def the_hard_way(interface):
896
617
            "Get an interface index the hard way, i.e. using fcntl()"
897
618
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
898
 
            with closing(socket.socket()) as s:
899
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
900
 
                                    struct.pack("16s16x", interface))
 
619
            s = socket.socket()
 
620
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
621
                                struct.pack("16s16x", interface))
 
622
            s.close()
901
623
            interface_index = struct.unpack("I", ifreq[16:20])[0]
902
624
            return interface_index
903
 
    return if_nametoindex(interface)
904
 
 
905
 
 
906
 
def daemon(nochdir = False, noclose = False):
 
625
        _func[0] = the_hard_way
 
626
        return _func[0](interface)
 
627
 
 
628
 
 
629
def daemon(nochdir, noclose):
907
630
    """See daemon(3).  Standard BSD Unix function.
908
631
    This should really exist as os.daemon, but it doesn't (yet)."""
909
632
    if os.fork():
911
634
    os.setsid()
912
635
    if not nochdir:
913
636
        os.chdir("/")
914
 
    if os.fork():
915
 
        sys.exit()
916
637
    if not noclose:
917
638
        # Close all standard open file descriptors
918
639
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
927
648
 
928
649
 
929
650
def main():
930
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
651
    global main_loop_started
 
652
    main_loop_started = False
 
653
    
 
654
    parser = OptionParser()
931
655
    parser.add_option("-i", "--interface", type="string",
932
656
                      metavar="IF", help="Bind to interface IF")
933
657
    parser.add_option("-a", "--address", type="string",
934
658
                      help="Address to listen for requests on")
935
659
    parser.add_option("-p", "--port", type="int",
936
660
                      help="Port number to receive requests on")
937
 
    parser.add_option("--check", action="store_true",
 
661
    parser.add_option("--check", action="store_true", default=False,
938
662
                      help="Run self-test")
939
 
    parser.add_option("--debug", action="store_true",
 
663
    parser.add_option("--debug", action="store_true", default=False,
940
664
                      help="Debug mode; run in foreground and log to"
941
665
                      " terminal")
942
666
    parser.add_option("--priority", type="string", help="GnuTLS"
947
671
                      default="/etc/mandos", metavar="DIR",
948
672
                      help="Directory to search for configuration"
949
673
                      " files")
950
 
    parser.add_option("--no-dbus", action="store_false",
951
 
                      dest="use_dbus",
952
 
                      help="Do not provide D-Bus system bus"
953
 
                      " interface")
954
 
    parser.add_option("--no-ipv6", action="store_false",
955
 
                      dest="use_ipv6", help="Do not use IPv6")
956
 
    options = parser.parse_args()[0]
 
674
    (options, args) = parser.parse_args()
957
675
    
958
676
    if options.check:
959
677
        import doctest
968
686
                        "priority":
969
687
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
970
688
                        "servicename": "Mandos",
971
 
                        "use_dbus": "True",
972
 
                        "use_ipv6": "True",
973
689
                        }
974
690
    
975
691
    # Parse config file for server-global settings
976
692
    server_config = ConfigParser.SafeConfigParser(server_defaults)
977
693
    del server_defaults
978
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
694
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
695
    server_section = "server"
979
696
    # Convert the SafeConfigParser object to a dict
980
 
    server_settings = server_config.defaults()
981
 
    # Use the appropriate methods on the non-string config options
982
 
    server_settings["debug"] = server_config.getboolean("DEFAULT",
983
 
                                                        "debug")
984
 
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
985
 
                                                           "use_dbus")
986
 
    server_settings["use_ipv6"] = server_config.getboolean("DEFAULT",
987
 
                                                           "use_ipv6")
988
 
    if server_settings["port"]:
989
 
        server_settings["port"] = server_config.getint("DEFAULT",
990
 
                                                       "port")
 
697
    server_settings = dict(server_config.items(server_section))
 
698
    # Use getboolean on the boolean config option
 
699
    server_settings["debug"] = server_config.getboolean\
 
700
                               (server_section, "debug")
991
701
    del server_config
992
702
    
993
703
    # Override the settings from the config file with command line
994
704
    # options, if set.
995
705
    for option in ("interface", "address", "port", "debug",
996
 
                   "priority", "servicename", "configdir",
997
 
                   "use_dbus", "use_ipv6"):
 
706
                   "priority", "servicename", "configdir"):
998
707
        value = getattr(options, option)
999
708
        if value is not None:
1000
709
            server_settings[option] = value
1001
710
    del options
1002
711
    # Now we have our good server settings in "server_settings"
1003
712
    
1004
 
    # For convenience
1005
 
    debug = server_settings["debug"]
1006
 
    use_dbus = server_settings["use_dbus"]
1007
 
    use_ipv6 = server_settings["use_ipv6"]
1008
 
    
1009
 
    if not debug:
1010
 
        syslogger.setLevel(logging.WARNING)
1011
 
        console.setLevel(logging.WARNING)
1012
 
    
1013
 
    if server_settings["servicename"] != "Mandos":
1014
 
        syslogger.setFormatter(logging.Formatter
1015
 
                               ('Mandos (%s): %%(levelname)s:'
1016
 
                                ' %%(message)s'
1017
 
                                % server_settings["servicename"]))
1018
 
    
1019
713
    # Parse config file with clients
1020
714
    client_defaults = { "timeout": "1h",
1021
715
                        "interval": "5m",
1022
 
                        "checker": "fping -q -- %%(host)s",
1023
 
                        "host": "",
 
716
                        "checker": "fping -q -- %%(fqdn)s",
1024
717
                        }
1025
718
    client_config = ConfigParser.SafeConfigParser(client_defaults)
1026
719
    client_config.read(os.path.join(server_settings["configdir"],
1027
720
                                    "clients.conf"))
1028
721
    
1029
 
    clients = Set()
1030
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
1031
 
                                 server_settings["port"]),
1032
 
                                TCP_handler,
1033
 
                                settings=server_settings,
1034
 
                                clients=clients, use_ipv6=use_ipv6)
1035
 
    pidfilename = "/var/run/mandos.pid"
1036
 
    try:
1037
 
        pidfile = open(pidfilename, "w")
1038
 
    except IOError:
1039
 
        logger.error("Could not open file %r", pidfilename)
1040
 
    
1041
 
    try:
1042
 
        uid = pwd.getpwnam("_mandos").pw_uid
1043
 
        gid = pwd.getpwnam("_mandos").pw_gid
1044
 
    except KeyError:
1045
 
        try:
1046
 
            uid = pwd.getpwnam("mandos").pw_uid
1047
 
            gid = pwd.getpwnam("mandos").pw_gid
1048
 
        except KeyError:
1049
 
            try:
1050
 
                uid = pwd.getpwnam("nobody").pw_uid
1051
 
                gid = pwd.getpwnam("nogroup").pw_gid
1052
 
            except KeyError:
1053
 
                uid = 65534
1054
 
                gid = 65534
1055
 
    try:
1056
 
        os.setgid(gid)
1057
 
        os.setuid(uid)
1058
 
    except OSError, error:
1059
 
        if error[0] != errno.EPERM:
1060
 
            raise error
1061
 
    
1062
 
    # Enable all possible GnuTLS debugging
1063
 
    if debug:
1064
 
        # "Use a log level over 10 to enable all debugging options."
1065
 
        # - GnuTLS manual
1066
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1067
 
        
1068
 
        @gnutls.library.types.gnutls_log_func
1069
 
        def debug_gnutls(level, string):
1070
 
            logger.debug("GnuTLS: %s", string[:-1])
1071
 
        
1072
 
        (gnutls.library.functions
1073
 
         .gnutls_global_set_log_function(debug_gnutls))
1074
 
    
1075
722
    global service
1076
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1077
723
    service = AvahiService(name = server_settings["servicename"],
1078
 
                           servicetype = "_mandos._tcp",
1079
 
                           protocol = protocol)
 
724
                           type = "_mandos._tcp", );
1080
725
    if server_settings["interface"]:
1081
 
        service.interface = (if_nametoindex
1082
 
                             (server_settings["interface"]))
 
726
        service.interface = if_nametoindex(server_settings["interface"])
1083
727
    
1084
728
    global main_loop
1085
729
    global bus
1088
732
    DBusGMainLoop(set_as_default=True )
1089
733
    main_loop = gobject.MainLoop()
1090
734
    bus = dbus.SystemBus()
1091
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1092
 
                                           avahi.DBUS_PATH_SERVER),
1093
 
                            avahi.DBUS_INTERFACE_SERVER)
 
735
    server = dbus.Interface(
 
736
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
737
            avahi.DBUS_INTERFACE_SERVER )
1094
738
    # End of Avahi example code
1095
 
    if use_dbus:
1096
 
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1097
 
    
1098
 
    clients.update(Set(Client(name = section,
1099
 
                              config
1100
 
                              = dict(client_config.items(section)),
1101
 
                              use_dbus = use_dbus)
 
739
    
 
740
    debug = server_settings["debug"]
 
741
    
 
742
    if debug:
 
743
        console = logging.StreamHandler()
 
744
        # console.setLevel(logging.DEBUG)
 
745
        console.setFormatter(logging.Formatter\
 
746
                             ('%(levelname)s: %(message)s'))
 
747
        logger.addHandler(console)
 
748
        del console
 
749
    
 
750
    clients = Set()
 
751
    def remove_from_clients(client):
 
752
        clients.remove(client)
 
753
        if not clients:
 
754
            logger.debug(u"No clients left, exiting")
 
755
            sys.exit()
 
756
    
 
757
    clients.update(Set(Client(name=section,
 
758
                              stop_hook = remove_from_clients,
 
759
                              **(dict(client_config\
 
760
                                      .items(section))))
1102
761
                       for section in client_config.sections()))
1103
 
    if not clients:
1104
 
        logger.warning(u"No clients defined")
1105
 
    
1106
 
    if debug:
1107
 
        # Redirect stdin so all checkers get /dev/null
1108
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1109
 
        os.dup2(null, sys.stdin.fileno())
1110
 
        if null > 2:
1111
 
            os.close(null)
1112
 
    else:
1113
 
        # No console logging
1114
 
        logger.removeHandler(console)
1115
 
        # Close all input and output, do double fork, etc.
1116
 
        daemon()
1117
 
    
1118
 
    try:
1119
 
        pid = os.getpid()
1120
 
        pidfile.write(str(pid) + "\n")
1121
 
        pidfile.close()
1122
 
        del pidfile
1123
 
    except IOError:
1124
 
        logger.error(u"Could not write to file %r with PID %d",
1125
 
                     pidfilename, pid)
1126
 
    except NameError:
1127
 
        # "pidfile" was never created
1128
 
        pass
1129
 
    del pidfilename
 
762
    
 
763
    if not debug:
 
764
        daemon(False, False)
1130
765
    
1131
766
    def cleanup():
1132
767
        "Cleanup function; run on exit"
1139
774
        
1140
775
        while clients:
1141
776
            client = clients.pop()
1142
 
            client.disable_hook = None
1143
 
            client.disable()
 
777
            client.stop_hook = None
 
778
            client.stop()
1144
779
    
1145
780
    atexit.register(cleanup)
1146
781
    
1149
784
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1150
785
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1151
786
    
1152
 
    if use_dbus:
1153
 
        class MandosServer(dbus.service.Object):
1154
 
            """A D-Bus proxy object"""
1155
 
            def __init__(self):
1156
 
                dbus.service.Object.__init__(self, bus, "/")
1157
 
            _interface = u"se.bsnet.fukt.Mandos"
1158
 
            
1159
 
            @dbus.service.signal(_interface, signature="oa{sv}")
1160
 
            def ClientAdded(self, objpath, properties):
1161
 
                "D-Bus signal"
1162
 
                pass
1163
 
            
1164
 
            @dbus.service.signal(_interface, signature="os")
1165
 
            def ClientRemoved(self, objpath, name):
1166
 
                "D-Bus signal"
1167
 
                pass
1168
 
            
1169
 
            @dbus.service.method(_interface, out_signature="ao")
1170
 
            def GetAllClients(self):
1171
 
                "D-Bus method"
1172
 
                return dbus.Array(c.dbus_object_path for c in clients)
1173
 
            
1174
 
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1175
 
            def GetAllClientsWithProperties(self):
1176
 
                "D-Bus method"
1177
 
                return dbus.Dictionary(
1178
 
                    ((c.dbus_object_path, c.GetAllProperties())
1179
 
                     for c in clients),
1180
 
                    signature="oa{sv}")
1181
 
            
1182
 
            @dbus.service.method(_interface, in_signature="o")
1183
 
            def RemoveClient(self, object_path):
1184
 
                "D-Bus method"
1185
 
                for c in clients:
1186
 
                    if c.dbus_object_path == object_path:
1187
 
                        clients.remove(c)
1188
 
                        # Don't signal anything except ClientRemoved
1189
 
                        c.use_dbus = False
1190
 
                        c.disable()
1191
 
                        # Emit D-Bus signal
1192
 
                        self.ClientRemoved(object_path, c.name)
1193
 
                        return
1194
 
                raise KeyError
1195
 
            
1196
 
            del _interface
1197
 
        
1198
 
        mandos_server = MandosServer()
1199
 
    
1200
787
    for client in clients:
1201
 
        if use_dbus:
1202
 
            # Emit D-Bus signal
1203
 
            mandos_server.ClientAdded(client.dbus_object_path,
1204
 
                                      client.GetAllProperties())
1205
 
        client.enable()
1206
 
    
1207
 
    tcp_server.enable()
1208
 
    tcp_server.server_activate()
1209
 
    
 
788
        client.start()
 
789
    
 
790
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
791
                                 server_settings["port"]),
 
792
                                tcp_handler,
 
793
                                settings=server_settings,
 
794
                                clients=clients)
1210
795
    # Find out what port we got
1211
796
    service.port = tcp_server.socket.getsockname()[1]
1212
 
    if use_ipv6:
1213
 
        logger.info(u"Now listening on address %r, port %d,"
1214
 
                    " flowinfo %d, scope_id %d"
1215
 
                    % tcp_server.socket.getsockname())
1216
 
    else:                       # IPv4
1217
 
        logger.info(u"Now listening on address %r, port %d"
1218
 
                    % tcp_server.socket.getsockname())
 
797
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
 
798
                 u" scope_id %d" % tcp_server.socket.getsockname())
1219
799
    
1220
800
    #service.interface = tcp_server.socket.getsockname()[3]
1221
801
    
1231
811
        
1232
812
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1233
813
                             lambda *args, **kwargs:
1234
 
                             (tcp_server.handle_request
1235
 
                              (*args[2:], **kwargs) or True))
 
814
                             tcp_server.handle_request\
 
815
                             (*args[2:], **kwargs) or True)
1236
816
        
1237
 
        logger.debug(u"Starting main loop")
 
817
        logger.debug("Starting main loop")
 
818
        main_loop_started = True
1238
819
        main_loop.run()
1239
820
    except AvahiError, error:
1240
 
        logger.critical(u"AvahiError: %s", error)
 
821
        logger.critical(u"AvahiError: %s" + unicode(error))
1241
822
        sys.exit(1)
1242
823
    except KeyboardInterrupt:
1243
824
        if debug:
1244
 
            print >> sys.stderr
1245
 
        logger.debug("Server received KeyboardInterrupt")
1246
 
    logger.debug("Server exiting")
 
825
            print
1247
826
 
1248
827
if __name__ == '__main__':
1249
828
    main()